Topic: RoR 3.0 - 4th ed of 'Agile Web Development with Rails' in beta pub now

As someone who has been exploring the quite significant changes in RoR 3.0 I recently found that the Pragmantic Bookshelf have put out a beta edition of their very popular book 'Agile Web Devel with Rails'  I have bought every edition since the 1st). … with-rails

It is a great way to get started & be building a sophisticated application that includes Ajax functionality.  The part I was esp interested in is how use of Ajax libs has changed in Rails 3.0 (my prior apps broke when I tried shifting them to 3.0 - I had to add a plug-in that restored the old deprecated Ajax lib calls but now want to rewrite those to the new style).